Patent GB-926695-A (GB)
Title: Cinematographic cameras
IPC: G03B1/12
Filed: 1959-05-22
Abstract: 926,695. Kinematograph cameras. J. BOLSEY. May 22, 1959, No. 17486/59. Class 97 (1). In a kinematograph camera of the kind described and claimed in Specification 818,586, wherein the camera casing houses the camera mechanism which includes (1) a pair of gear trains connected end-to-end in series through a pair of bevel gears and located in separate compartments on opposite sides of a dividing wall in the camera, (2) a film transport mechanism, (3) a footage indicator, and (4) a shutter, the first train of gears which all have parallel axes starting with a hand wound spring motor and ending in a governor and the second train driving with its final gear the film transport claw and the shutter, and wherein the film is located in a magazine in a third compartment of the casing, the camera casing is small enough to fit into the palm of the hand and the part of the casing housing the camera mechanism comprises a pair of parts which co-operate to hold the mechanism in the interior of the camera. As shown, the drive spring and gearing are mounted between plates 22, 24 held apart by a block 26 and, other spacers, the shutter, film transport and objective supporting unit is mounted on the plates by means of openings 22a, 24a and the assembly is positioned within an inner framing 16 which is inserted into the outer casing 12 and locked therein by the viewfinder assembly 28 which extends between the plates 22, 24 and is held by screws passing through the plate 24, while a screw 33 passing through openings 35 in the outer casing 12 and inner framing 16 is threaded into the block 26. The removable cover 14 is provided with a window through which film speed and other exposure information marked on the film magazine can be seen. The driving mechanism, spring motor winding key, governor, film feeding drive and claw feed, and footage counter arrangements are substantially as in Specification 818,586 and the magazine is as disclosed in Specification 818,813, but the following additional features are disclosed. The film is laterally located at the exposure gate by pins engaging the film margin (Figs. 16, 16A, not shown), the shutter comprises a pair of relatively adjustable semicircular discs (Fig. 5, not shown), and a camera release and control knob 160 (Figs. 2 and 5, not shown) is provided which can be rotated to four different positions, in one of which its release operation is prevented, i.e. the camera mechanism is locked, in another of which single exposures are effected by pressing in the knob, in a third position a kinematographic series of exposures is obtained whilst the knob is held pressed, and in a fourth position the knob when pressed is latched in the depressed position and allows a continuing series of exposures. A signal connected to the footage indicator and also a signal indicating the spring motor tension are visible in the viewfinder (see Figs. 9, 14, 15, not shown) and on removing the magazine from the camera the footage indicator is disconnected from the drive mechanism. Some slightly differing forms of spring motor governor and of pressure plate for the magazine are described with reference to Figs. 3, 3A, 3C and Figs. 19A, 19B respectively (all not shown).